DQRID : D030922.1
Start DateStart TimeEnd DateEnd Time Data Quality Metric
11/20/2001000001/07/20022359Missing
more
Subject:
TWP/MPL/C2 - laser diode failure
DataStreams:twpmplcbh1scottC2.c0, twpmplnor1campC2.c1, twpmplcmask1clothC2.c1, twpmplsmask1clothC2.c1,
twpmplC2.00, twpmplcbh1scottC2.c1, twpmplC2.a1
Description:
On Nov 20, 2001, following a data gap of several hours the MPL energy monitor reading 
showed an abrupt decrease of about 60%.  The laser energy continued to decrease to a reading 
of zero by Nov 23.  Cloud detection is satisfactory through Nov 21, but is not 
satisfactory after this time until the laser diode was replaced on Jan 08, 2002.  Data between the 
dates of 2001-11-22 and 2002-01-08 inclusive is not useful.
Suggestions: 
Use alternate sources of cloud base height such as the millimeter cloud radar (MMCR) 

or the VCeil ceilometer.
Measurements:twpmplsmask1clothC2.c1:
  • Heights
  • base_time
  • SigniMaskMplCloth
  • time_offset
more
twpmplnor1campC2.c1:
  • cloud_base_height
  • height
  • energy_monitor
  • instrument_temp
  • cloud_top_height
  • shots_summed
  • random_error
  • background_signal
  • laser_temp
  • pulse_rep
  • cloud_mask_2
  • cloud_mask_1
  • time_offset
  • alt
  • detector_temp
  • baseline_update_time
  • lat
  • lon
  • base_time
  • backscatter
  • cloud_top_attenuation_flag
more
twpmplC2.a1:
  • energy_monitor
  • time_offset
  • laser_temp
  • total_counts
  • laser_sync_offset
  • voltage_10
  • scalar_sync_offset
  • pulse_rep
  • voltage_15
  • range_bin_time
  • laser_scalar_sync_offset
  • shots_summed
  • height
  • transceiver_azimuth_angle
  • property
  • lon
  • shots_sum
  • base_time
  • transceiver_altitude_angle
  • detector_temp
  • range
  • preliminary_cbh
  • instrument_temp
  • alt
  • trigger_freq
  • backscatter
  • deadtime_correction
  • range_bins
  • lat
  • background_signal
  • range_offset
  • max_altitude
  • range_bin_width
  • filter_temp
  • time
  • voltage_05
more
twpmplcbh1scottC2.c1:
  • lon
  • cbh
  • base_time
  • time_offset
  • lat
  • alt
more
twpmplC2.00:
  • Raw data stream - documentation not supported
more
twpmplcmask1clothC2.c1:
  • CloudMaskMplCloth
  • time_offset
  • Heights
  • base_time
more
twpmplcbh1scottC2.c0:
  • Raw data stream - documentation not supported
more

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